<template>
  <div
    id="default_drag_comp"
    @click="goNext"
    @touchstart="down"
    @touchmove="move"
    @touchend="end"
  >
    <span></span>
  </div>
</template>

<script>
export default {
  name: 'defaultDrag',
  data() {
    return {
      flags: false,
      position: { x: 0, y: 0 },
      nx: '',
      ny: '',
      dx: '',
      dy: '',
      xPum: '',
      yPum: '',
    }
  },

  components: {},

  computed: {},

  mounted() {},

  methods: {
    goNext() {
      console.log(11)
      this.$router.push('/info')
    },
    // 实现移动端拖拽
    down() {
      let default_drag_comp = document.querySelector('#default_drag_comp')
      this.flags = true
      var touch
      if (event.touches) {
        touch = event.touches[0]
      } else {
        touch = event
      }
      this.maxW = document.body.clientWidth - default_drag_comp.offsetWidth
      this.maxH = document.body.clientHeight - default_drag_comp.offsetHeight

      this.position.x = touch.clientX - default_drag_comp.offsetLeft
      this.position.y = touch.clientY - default_drag_comp.offsetTop
      this.dx = touch.clientX
      this.dy = touch.clientY
    },
    move(event) {
      event.preventDefault()
      let default_drag_comp = document.querySelector('#default_drag_comp')
      if (this.flags) {
        var touch
        if (event.touches) {
          touch = event.touches[0]
        } else {
          touch = event
        }
        this.nx = touch.clientX - this.position.x
        this.ny = touch.clientY - this.position.y

        if (this.nx < 0) {
          this.nx = 0
        } else if (this.nx > this.maxW) {
          this.nx = this.maxW
        }

        if (this.ny < 0) {
          this.ny = 0
        } else if (this.ny >= this.maxH) {
          this.ny = this.maxH
        }

        default_drag_comp.style.left = this.nx + 'px'
        default_drag_comp.style.top = this.ny + 'px'
        //阻止页面的滑动默认事件；如果碰到滑动问题，1.2 请注意是否获取到 touchmove
        document.addEventListener(
          'touchmove',
          function() {
            // event.preventDefault();
          },
          false
        )
      }
    },
    //鼠标释放时候的函数
    end() {
      this.flags = false
    },
  },
}
</script>
<style scoped>
#default_drag_comp {
  width: 55px;
  height: 55px;
  border-radius: 50%;
  box-shadow: 0 0 10px 2px #d3d3d3;
  background: #1d78e7;
  position: fixed;
  z-index: 1000;
  bottom: 70px;
  right: 25px;
  display: flex;
  justify-content: center;
  align-items: center;
}
#default_drag_comp span {
  display: inline-block;
  width: 25px;
  height: 25px;
  background: url(https://static.meiqia.com/widget/static/icon-mq-round@2x.png) -74.5px
    1px;
  background-size: 50px auto;
}
</style>
